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A New Low-Temperature Synthesis of l,2-Dihydro-l,2-diphosphetes

✍ Scribed by Dr. Louis Ricard; Dr. Nicole Maigrot; Dr. Claude Charrier; Prof. François Mathey

Book ID: 101556644
Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 252 KB
Volume: 26
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.198705481

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✦ Synopsis

C2 atom is significantly pyramidalized. Despite these distortions, the C=Sn distance (2.025 A) is in good agreement with that calculated for HZC=SnH2 (1.982 A).[51 The short distances B I-C2 (1.5 10( 6)) and B3-C2 (1.494(7) A)-which are practically identical with the corresponding distances in the 1,3-dihydro-l,3-diborete (7 with R 2 = N(CH,),) synthesized by Siebert et al.'"'-confirm the importance of the ylide resonance form B, which was concluded from the "B-NMR chemical shift data. This resonance form also helps to explain the extremely high-frequency It9Sn-NMR signal.

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